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Net Income (Loss) Per Share - Anti-dilutive Securities (Detail) - $ / shares
3 Months Ended 9 Months Ended
Sep. 27, 2019
Sep. 28, 2018
Sep. 27, 2019
Sep. 28, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Potentially dilutive equity awards outstanding 686,000 8,569,000 11,318,000 7,993,000
Effect of dilutive securities from convertible debt 3,468,000      
Stock Option        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Potentially dilutive equity awards outstanding 678,000 3,219,000 2,699,000 3,386,000
Restricted Stock Units (RSUs)        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Potentially dilutive equity awards outstanding 8,000 3,266,000 2,860,000 2,933,000
Employee Stock Purchase Plan        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Potentially dilutive equity awards outstanding 0 529,000 475,000 635,000
Convertible Debt        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Potentially dilutive equity awards outstanding     1,156,000  
Warrant        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Potentially dilutive equity awards outstanding [1] 0 1,555,000 4,128,000 1,039,000
Company average common stock price for a given period exceeds conversion price $5.75 for 2020 Notes [Member] | Convertible Note due 2020        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Debt Instrument, Convertible, Conversion Price $ 5.75   $ 5.75  
Effect of dilutive securities from convertible debt 7,962,609      
Company average common stock price for a given period exceeds conversion price $8.66 for 2024 Notes [Member] | Convertible Note due 2024        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Debt Instrument, Convertible, Conversion Price $ 8.66   $ 8.66  
Effect of dilutive securities from convertible debt 13,337,182      
[1] See Note 15, “Warrants” for additional information.